Explore a 15-minute conference talk from NSDI '24 that delves into UFO, an innovative QoS-aware core management system designed for virtualized and oversubscribed public cloud environments. Learn about the challenges faced when combining multi-tenancy, virtualization, and resource oversubscription in public clouds, including double scheduling issues with latency-critical workloads, inner-VM resource contention, and the lack of application-level performance metrics. Discover how UFO addresses these challenges through vCPU-pCPU coordination and fine-grained inner-VM resource isolation, resulting in significant physical core savings compared to existing core management solutions. Gain insights into optimizing resource efficiency and performance in modern cloud computing infrastructures.